Fix NPC drop bug

model.py

@@ -100,7 +100,7 @@ def is_npc_drop(data_previous, data_latest):
     npc_drop = False
     if data_latest.total_shares - data_previous.total_shares > 0:
         print('data_latest.total_shares {}'.format(data_latest.total_shares))
-        print('data_previous.total_shares {}'.format(data_previous.totals_shares))
+        print('data_previous.total_shares {}'.format(data_previous.total_shares))
         npc_drop = True
     return npc_drop